Locking device for sawmill-dogs.



I. W. MORRIS.

LOCKING DEVICE FOR SAWMILL DOGS. APPLICATION men sumac, ma.

1,139,955 Patented May11,1915.

ATTORNEY Y LOCKING DEVICE FOR SAWMILL-DOGS.

Specification of Letters Patent.

Patented May 11, 1915.

Application filed September 30, 1913. Serial N 0. 792,653.

To all whom it may concern Be it known that 1, JOHN W. MORRIS, a citizen of the United States, residing at Kila, in the county of Flathead and State of Montana, have invented a new and useful Locking Device for Sawmill-Dogs, of which the following is a specification.

The invention relates to a locking device tween the arm and the latch lever 1. The

for saw mill dogs.

The object of the present invention is to provide a simple, inexpensive and efficient resilient locking device of strong and durable construction, adapted to be readily applied to various makes of head blocks in common use, and capable of securely holding the-operating lever of a saw mill dog in an elevated position when the same is not in use.

With these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawing, and pointed out in the claims hereto appended; it being understood that various'changes in the form, proportion, size and minor details of construction, within the scope of the claims, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing :-Figure 1 is a side elevation of a saw .mill vdog equipped with a resilient locking device, constructed in accordance with this invention. Fig- 2 is an end elevation partly in section. Fig. 3 is a perspective view of the resilient locking de- Like numerals of reference designate corresponding parts in all the figures of the drawing.

In the accompanying drawing in which is illustrated the preferred embodiment of the invention, the resilient locking device comprises in its construction a spring actuated latch lever 1 and a supporting bar 2, arranged at an inclination and having a lower attaching portion secured by bolts 3 and 4:

or other suitable fastening devices to a knee.

end with a head, has a threaded lower end portion 10, which receives a milled nut 11 for varying the tension of a coiled spring 12 disposed on the screwand interposed belatch lever 1, which is constructed of suitable metal, is arranged at an inclination in spaced relation with the supporting bar and is provided at its lower end with a laterally extending portion 13, and it has an arm 14 projecting upwardly from the laterally extending portion 13 and pivoted at its upper terminal to the supporting bar by the bolt 4:. The other end of the latch lever is bent to form an approximately triangular loop 15 constituting a head and consisting of angularly disposed inner and outer portions 16 and 17 and a top portion 18 having a perforation 18 through which the screw passes. The inner portion 16 is disposed at nearly a right angle to the body portion of the latch lever 1. and forms a shoulder for engaging a laterally extending pin 19 of an operating lever 20 of a saw mill dog, and the outer portion 17 which extends upwardly at an acute angle is arranged at an inclination and presents a lower inclined face adapted to be engaged by the said pin 19 when the operating lever is swung upwardly to the position illustrated in Fig. 1 of the drawing. The pin is adapted to lift the head of the latch lever against the action of the coiled spring and to pass beneath the head and into engagement with the shoulder at the inner end thereof. The

milled nut enables the tension of the spring to be adjusted. The resilient locking device is adapted to be applied to various makes of saw mill dogs, and owing to the strength and durability of the construction, it is not liable to be easily broken or get out of order. Should the coiled spring become broken or otherwise defective, it may be readily replaced by a new spring. The device may be made either right or left hand to enable it to be arranged at either side of a knee.

What is claimed is 1. The combination with a relatively fixed support and a pivotally mounted operating lever provided with a lateral projection, of

a supporting bar secured to the said support and projecting therefrom, a latch lever arranged below and in spaced relation with the supporting bar and pivotally connected 4 at one end with the same, sa'id latch lever being provided at the other end with a downwardly projecting head arranged to engage with the lateral projection of the operating lever, and a spring interposed between the supporting bar and the latch lever and arranged to urge the latter downwardly.

2. The combination with a relatively fixed support and a pivotally mounted operating lever provided with a lateral projection, of an inclined supporting bar secured at its lower end to and projecting from the said support and providedat itsupper end with a lateral extension, an inclined latch lever.

arranged below and in spaced relation with the supporting bar and provided at its up per end with a head adapted to engage with the lateral projection of the operating lever, said latch lever having its lower end bent laterally toward the support and provided with an upwardly extending arm pivoted to the lower end of the supporting bar, and slidable means connected with the laterally extending arm of the supporting bar and with the headof the lever for urging the latter downwardly.

3. The combination with a relatively fixed support and a pivotally mounted operating lever provided with a lateral projection, of a supporting bar secured at one end to the support and pivoted to the attached end of the same, said latch lever having its other end portion bent downwardly atapproximately a right angle and then upwardly at an acute angle to substantially the plane of the latch lever and then bent inwardly to F. N. HAINEs, HENRY STEENERSON. 

